Combined work and tool holder



Feb. 3, 1942. c. T. ALLMENDINGER 2,271,532

COMBINED WORK AND TOOL HOLDER Filed April '7, 1941 2 Sheets-Sheet v1 111 1 L.. J Ll. 1

Feb. 3, 1942. an: ALLMENDINGER 2,271,532

k COMBINED WORK AND TOOL HOLDER Filed April '7, 1941 2 Sheets-Sheet 2Patented Feb. 3, 1942 UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to combined work and tool holder more particularfor machineshops.

The device is specially adapted for metal parts to be worked on by suchtools as a reamer, tap or the like, which, for example, can beappropriately operated by hand.

The invention desirably provides improved means for these purposes, as asomewhat unitary device affording enhanced accuracy and speed ofoperation while at the same time being markedly simple and economical inconstruction and assembly.

Other objects and advantages will be apparent from the followingdescription, taken together with the accompanying drawings, in which-Figure 1 is an elevational view of one form of the device in accordancewith the present invention;

Figure 2 is a plan view of the structure of Fig, 1 showing in dottedlines alternative positions of the device parts and also indicating inbroken lines a product part to be worked on;

Figure 3 is a fragmentary elevational view corresponding somewhat to theright-hand side of Fig. 1 but showing one modification of the invention;and

Figure 4 is a plan view of the structure of Fig. 3

.but with the parts in other selective positions and a tool in place foroperation on a product work part shown in dotted lines.

Referring in detail to the illustrative expedients shown in thedrawings, the bed plate III provides the customary base for theoperations presently to be described, and may be provided withperforated lugs II at each end by which it can be bolted to a table,bench or other support (not shown) which will elevate it to a suitableheight for convenient use by a workman in standing position. The bedplate I may have the usual recess I2 therein over which a hole in thework may be located so that the tool may pass through the hole and notstrike the bed plate.

In accordance with the present invention, the

bed plate I0 is here shown laterally enlarged along one edge thereof toform ears I3 and I4. In the ear I3 is mounted a cylindrical post I5 andin the ear I4 another cylindrical post I6, the post I6 beingadvantageously taller than the post I5 for purposes presently described.It will be understood that the ears I3 and I4 may be drilled out toreceive the posts I5 and I6 by a tight drive fit, as indicated at I! sothat the posts are securely and firmly mounted on the bed plate,extending upwardly therefrom.

Passed telescopically onto each of the posts I5 and I6 respectively is atubular mounting I8, for the post I5, and I9 for the post I6. Thesemountings engage the posts snugly while permitting rotation of themounting with respect to the post except when prevented by turn screw 20for each mounting and which passes through an internally threaded boss2| in the mounting to engage the post and prevent relative movement.Each of the turn screws 20 is preferably provided with a finger lever 22for ease of turning.

Extending from each of the tubular mountings I8 and II! respectively isa rigid arm, 23 for mounting I8, and 24 for the mounting I9, and each ofthese arms terminates in a sleeve part, such as 25 for the arm 23, and26 for the arm 24, these sleeves being adapted to carry reciprocallyeach a work engaging element next described.

As here shown, sleeve 25 carries an externally screw threaded clampingmember 21 cooperating with internal screw threads in the sleeve 25 andthus adapted to be movable by a helical motion toward and from the bedplate III to clamp the work such as 28 (Fig. 2) temporarily to the bedplate. At its lower end, the clamping member 21 may have a foot 29depending by a swivel ball-joint 30 therefrom, this foot beingpreferably cloven as at 3| to enhance its fric-.

tional engagement with the work, and, so constructed, it will adaptablycontact to press the work against the bed plate. For rotating theclamping member as just described, its upper end terminates in a knob 32from which laterally projects one of the finger levers 22.

As clearly shown in the drawings, the other sleeve 26 on the arm 24carries, passing slidably therethrough, a tool supporting rod 33, whichis freely rotatable in the sleeve, the rod 33 having a cross rod 34 atits upper end which acts as a hand lever for manually rotating the rod33 for purposes later pointed out.

In order to limit downward movement of the arm 24 toward the bed plate,the post I6 may have a collar 35 thereon below the tubular mounting I 8and the position of which may be adjustably fixed as by a set screw 36turnable by the usual screw driver. Also, to limit downward movement ofthe tool supporting rod in the sleeve 26 the rod 33 may carry a collar31 above the sleeve 26 and which may be adjustably fixed on the rod asby another set screw 36.

Further in accordance with the present invention, the sleeve 26 isdesirably rotatably carried by the arm 24 on an axis parallel with thebed plate III whereby to vary the angle of the tool supporting rod withrespect to the bed plate, and for this purpose the sleeve 26 may beformed separately from instead of integral with the arm 24, and, as hereshown, has a cylindrical shank 38 which is snugly but rotatably receivedin a similar axial bore 38a in the outer end of the arm 24, the arm andsleeve having mating circular faces as at 39. One of the turn screws 20is shown projecting laterally from the bore 38a for fixing the angle ofthe tool rod 33 with respect to the bed plate.

It will be understood that the work 28, clamped to the bed plate In asshown, for example, in Fig. 2, may be operated on by use of the toolsupporting rod 33 which is shown terminating at its lower end in aconventional chuck 40, the details of which are well known in the artand need not be here particularly described, since they form no part ofthe present invention. Suffice it to say that the chuck 4!) permits thetool supporting rod 33 to support any appropriate tool for the purpose,such as a reamer, tap, or the like. The work, having a hole 4! saytherein placed just above and in register with the recess l2, may bereamed or tapped by the means just described, the clamping arm 23 havingbeen swung about its post is over the work 28 as shown in dotted linesin Fig. 2, the turn screw 20 having been then tightened to fix therelative positions of the sleeve 18 and post i5, and the clamping member2'! having then been adjusted to upon the work. Also, as shown in dottedlines in Fig. 2, the tool carrying arm 24 has been swung on its post Itto a position directly over the hole 4| and the set screw 20 for thesleeve I9 having been tightened to fix this relationship. As shown in 2,the tool supporting rod 33 is directly perpendicular and its position isfurther fixed by the set screw 20 carried by arm 24 at the bore Sila.

Turning now to the modification of the invention shown in Figs. 3 and 4,an articulated arm 42 may be substituted for the arm 24 and thisarticulated arm may comprise one exten sion arm part 43 and anotherextension arm part 24, this being conveniently the same arm 24previously referred to, these parts being articulated by aninterengaging coupling 45. In this instance the coupling 45 is formed bya cylindrical enlargement 26 on the lower extension arm part 43 whichhas a reduced upwardly directed cylindrical continuation 4?. This upwardextension 41 functions like the post Hi and fits snugly but rotatab-lyinto the part IS on the upper extension arm part 24 which telescopesthereon. The set screw 20 carried by the tubular mounting l9 fixes therelative angular relationships of the extension arm parts 43 and 24, asdesired, the arm parts 43 and 24 together forming the articulated arm42, one relative angular relationship being clearly shown in Fig. 4.

Also, as shown in Fig. 4, by making use of this particular position ofthe articulated arm 42 the tool supporting rod 33 may be set parallelwith a part it to be worked on and the tool 50 may thus be directedhorizontally toward say a horizontal hole 51 in an upstanding part 52 ofthe work 49.

It will be apparent to those skilled in the art that by means of myinvention herein described the tap, for example, may be started straightand will follow through the hole in perfect alignment, leaving a cleancut thread and avoiding broken taps, and this lnay be accomplished byone workman with the aid of my invention, while affording a wide rangeof application.

Manifestly, the invention is not limited to details of constructionshown for purposes of exemplification, and such changes may be made asfall within the scope of the following claims with out departing fromthe invention.

Having described my invention, 1 claim:

1. In a device of the class described embodying a work supporting bedplate and work engaging members carried by the bed plate, one of saidwork engaging members being for clamping the work to the bed plate andthe other work engaging member being for operating upon the work, thatimprovement therein which comprises a post fixed perpendicular to saidbed plate, an arm mounted for rotation about said post, a sleeve carriedon the outer end of said arm, the axis 01'. said sleeve beingperpendicular to the axis of said arm, and the sleeve being rotatable onthe axis of the arm, a tool holder rod passing slidably and rotatablythrough said sleeve whereby the tool holder rod may be operated on anaxis perpendicular to the bed plate or horizontal to the bed plate or atangular positions varying therebetween, and means for adjustably fixingthe 1'0- tative positions of said arm on said post and of the saidsleeve on said arm.

2. In a structure of the class described embodying a support post and anarm for a tool holder mounted on said support post for rotationthereabout, that improvement therein in which the arm is articulated andincludes a pair of extension arm parts, mechanism for selectively fixingthe relative angular position of the said arm parts, an axiallyextending bore in the outer end of the outer extension arm part, a shankreceived in said bore and rotatable therein, a sleeve carried by theshank transversely thereto, and a tool supporting rod slidable in saidsleeve whereby the tool supporting rod is rotatable on an axis parallelwith said arm, and means for adjustably fixing selective rotativepositions of the said shank in said bore.

3. In a device of the class described embodying a work supporting bedplate, means for clamping the work to the bed plate, and a tool holderalso mounted on said bed plate, that improvement therein which comprisesmeans for mounting the tool holder for rotation both on an axis perpendicular to the bed plate and on an axis horizontal to the bed plate, andmeans for adjustably fixing the tool holder in selective positions onboth of said axes.

4. In a structure of the class described embodying a support post and anarm for a tool holder mounted on said support post for rotationthereabout, that improvement therein which comprises means for mountingthe tool holder on said arm for rotation on an axis parallel with thearm, and means for adjustably fixing the tool holder in a selectiveposition on said axis.

5. In a structure of the class described embodying a support post and anarm part for a tool holder part mounted on said support post forrotation thereabout, that improvement therein which comprises an axiallyextending bore in one of said parts, a shank on the other part receivedin said bore and rotatable therein, a sleeve carried by the tool holderpart transversely t0 the arm part, and a tool supporting rod rotatableand slidable in said sleeve whereby the tool supporting rod is rotatableon an axis parallel with said arm, and means for adjustably fixingselective rotative positions of the said shank in said bore.

CHARLES T. ALLMENDINGER.

